Filter



M. WILDERMAN FILTER Filed May 2, 1935 4 Sheets-Sheet l mms3 M. WILDERMAN @cm L W35,

FILTER Filed May 2, 1935 4 Sheets-Sheet 2 INVENTOR Oct.. l, 1935. MA wlLnERMAN 2,016,163

FILTER Filed May 2, 1933 v 4 Sheets-Sheet 3 www WW @im 12% 9g M M` WILDERMAN Oct. 1, 1935.

FILTER Filed May 2, 1955 4 Sheets-Sheet 4 lNvENToR m @mwa 9. @M

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Patented Oct. 1, 1935 FILTER Meyer Wilderman, Monte Carlo, Monaco, assignor to The American Wilderman Porous Ebonite Company, Philadelphia, Pa., a corporation of Pennsylvania Application May 2, 1933, Serial No. 668,955 In Great Britain June $0, 1932 7 Claims. (C1. 21B-182) This invention relates to lters which may be of the filter press type or vacuum ilter type. It provides a large ltering capacity for a given space and is so constructed that the cakes formed between the filter plates can be removed simul ing a removable top 3 and a removable bottom 5 taneously by air pressure or circulation of liq- 4 secured to the body by bolts 5. The body 2 is uid without the necessity of taking the iilter apart formed of side plates B and end plates 'I provided and removing the cakes individually. 'Ihe lter with strengtheningnribs 8. It also has a top is adapted for iltering solutions containing very ange 9 and Aa bottom flange I0 provided with fine suspensions, for which at the present time openings II, which iianges are connected re- 10' a Seitz or similar iilter is ordinarily used. A Seitz iilter contains metal gauze sheets attached to and supported by a grid. In using such a lter, a liltering medium such as asbestos iiakes is mixed with a portion of the solution to be ltered and this portion is introduced into the lilter, thereby depositing the asbestos liakes on the gauze sheets, so that the asbestos forms a filtering medium for the rest of the solution to be filtered. rIhe type of iilter just described is unsatisfactory in that the backwashing sometimes forms holes in the asbestos sheet and allows the washing solution to pass therethrough Without Washing the remainder of the cake. The amount of asbestos or -other filtering material necessary to use is relatively large, which makes the operation costly. It is not adapted for iiltering solutions of acids or certain other chemicals which would attack the gauze sheets.

These disadvantages are overcome according to the present invention, in which the filter plates preferably are formed of porous ebonite. The iilter plates may be made in accordance with my Patent No. 1,651,567, granted December 6, 1927.

In the accompanying drawings, which illustrate several embodiments of my invention,

Figure 1 is a vertical section taken on the line I-I of Figure 2;

Figure 2 is a horizontal section taken line IL-II of Figure 1;

Figure 3 is a vertical section through a single iilter plate as it would appear if taken on the line III-III of Figure 2;

Figure 4 is a vertical section of a modified type of filter;

Figure 5 is a horizontal section taken on the line V-V oi Figure 4.;

Figure 6 is a top plan view of the apparatus shown in Figure 4 illustrating the manner in which the bottom of the lter may be brought into and out of position;

Figure 7 is a detail perspective view of the means for raising and lowering the removable bottom of the filter shown in Figure 4;

Figure 8 is a vertical section through another type of filter in which the lter plates may be removed bodily from thecasing, the View being taken on the line VIII- VIII of Figure 9;

Figure 9 is a horizontal section taken on the line IX-IX of Figure 8; and

on the Figure 10 is Aa broken side elevation of one of the iilter plates,

Referring more particularly to Figures 1, 2 and 3, the iilter comprises a body portion 2 havspectively by the bolts 5 to a flange I2 formed on the top 3 and a iiange I3 formed on the bottom 4. Packing I4 is inserted between the flanges in order to make the filter liquid-tight.

A plurality of filter plates indicated generally by the reference numeral I5 is arranged in spaced relation inside of the casing. The iilter plates are supported by horizontal bars I6 which eX- tend between the end plates l adjacent the bottom thereof and secured thereto. are maintained in spaced relation With each other so as to provide spaces for the solution to be iiltered, by grooved bars I'I secured to the end plates l, the vertical edges of the iilter plates fitting into grooves I8 formed in the bars Il.

The construction of each of the iilter plates I5 is shown in Figure 3. It comprises top and bottom bars 20, side bars 2I and angle shaped corner bars 22, all of the bars preferably being made of metal covered With ebonite. Inside of the frame formed by the bars 20, 2I and 22 is a ltering body 23 preferably formed of porous ebonite. The iiltering body 23 is provided with spaced vertical channels 24 which are connected The plates 20 at the top and bottom by horizontal channels 25 35 and 2S. Communicating with the upper horizontal channel 25 is a pipe 21. The pipes 2l of each individual filter plate I5 are connected to a header 28, as shown in Figure 1, and connected to the header is a pipe 29 which extends 4 out through the top 3 of the filter. The top 3 is provided withan opening 36, through which air or water may be supplied for removing the filter cake after the ltering operation has been completed. The lter plate is provided with handles 3I In the operation of this lter, the solution to be iiltered and containing solids in suspension is Y introduced into the filter through an opening 32 r formed in Jme bottom 4. The air opening so in 0 the top of the lter is plugged at this time so as to form a liquid-tight chamber. The solution to be iiltered flows upwardly between the filter plates I5, the solids depositing on the outside of the plates and the filtrate passing through the 5-5 filter plates into the internal channels 24, 25 and 26. The filtrate iiows through the pipes 21, header 28 and pipe 29 which extends outside of the filter apparatus. In this operation, the solution to be filtered occupies the Whole interior of the casing above, below and between the filter plates, thus exerting an equal pressure on allsides of theplates. The operation can be carried on under pressure or partial vacuum, the pipe *29 in the latter case being connected to a source of`V Yand the bottom 4 moved out of position. Air is then introduced through opening 30, and if desired, through pipeV 29. The air introduced through pipe 29 howsV into the channels formed in the lter plates, thereby ,pressing Vthe cake away from the plates and aiding the air introduced through opening 39 in removing the cakes from the spaces between iilter plates. The filter plates are preferably made slightly thicker at the top than at the bottom so as to aid inthe easy removal oi the cakes. This construction of the lter plate is shown in Figure l0. When the ilter plates are arranged within the casing they provide free spaces for the solution to be ltered, which spaces are wider at the bottom than at the top so as to make it easy to remove the cakes formed between the filter plates. If desired, air may be introduced into the casing after the solution has been removed therefrom, the air acting to force the liquid contained in the cakes into the channels formed in the lter plates, thereby drying the cakesi The bottom 4 is then removed and air admitted through the pipe 29 so as to loosen the deposit from the filter plates and cause it to drop through the open bottom of the casing.

After the cakes have been removed, the bottom 4 is again secured to the body portion 2 of the iilter and water is introduced into pipe 29 and causedV to flow through the internalV channels in the lter plates and then into the spaces between the filter plates so as to clean the plates preparatory to a new filtering operation.

Referring to the embodiment shown in Figures 4 through 7, the filter comprises a cylindrical body portion 49 having a removable top 4| and a removable bottom 42. The top is provided with openings 43 and 44, through which'air or liquid may be admitted for washing purposes. Inside of the cylindrical outer casing 4|) is an inner casing formed oi vertical plates 45 providing a square chamber in which are located iilter plates 46. The cylindrical outer casing 40 is formed with four inturned anges 41 which support the plates 45 forming the lter chamber.' This construction provides four chambers 4B, each chamber being formed by a segment of the cylindrical casing 48,

`one of the plates-45, and one of Vthe flanges 41.

The anges 4l are cut away at the corners of the lter chamber formed by the plates `45, thereby providing openings 49 which place the chambers 48 in communication with each other. The iilter plates 49 are supported by flangesV 59 `formed on the bottoms oi two of the plates 45, and are maintained in spaced relation by meansY oi grooved bars el also secured to two of the plates 45. The bottom i2 of the filter is secured to the cylindrical tbody portion 4i) by swinging bolts 52V which iit into groovesv 53 formed in the flanges 54 and 55 oi the body portion 4D and bottom 42.

The bottom i2 may beY dropped away from the body portion i9 and moved on rails into another .position In order to accomplish this, two extensions 56 are formed on the iiange 55 at diametrihas stopped and runs on a rail 59.

cally opposite points, as shown in Figure 6. Each of these extensions is provided with openings 5l,

in each of which is mounted a wheel 58 which K These rails are supported by brackets Si! which, in turn, are secured to main s supports 5 as shown in Figure 4. A lifting jack as indicated in Figure 7, is arranged on opposite sides of the bottom 42 for raising and lowering it so that it may be connected and disconnected from the body portion 49 of the filter. The jack i0 comprises a screw 92 operated by a wheel 63 and carrying at its lower end a shoe 64 which ts over the rail 59. When it is desired to remove the bottom 42, the swinging bolts 52 are loosened and the screw @2 is turned so as to cause the wheels 15 58 to rest on the rails 59. The bottom 42 may then be moved by hand from the full line to the chain line position shown in Figure 6. After the cakes have been removed from between the filter plates, as hereinafter described, the bottom 42 20 is returned to position under the body portion 4G. Y The screw 62 is then operated to raise the bottom into the position shown in Figure 4 and the bolts 52 are tightened.

The solution to be iiltered is introduced through 25 a pipe controlled by a valve 55. It passes between the iilter plates, the solids depositing on the outside of the plates and the liquid ilowing through intoA the internal channels formed in the lter plates. The filtrate is led from the channels bypipes El controlled by valves 68, the pipes being connected to a header 69. The pipes 61 extend through plates 45 and communicate with the internal passages in the lter plates on the side of the iilter plate adjacent the top. As shown 35 in Figure 5, there are two series of pipes B1 and two headers 69, one series being located on each side of the iilter the pipes of each series communicating with alternate filter plates. Y

After the ltering operation has stopped,`the 40 liquid is discharged through pipes 65 and l0 and the bottom 42 is detached from the body portion 46 and removed as previously described by operating the screw 52. The cakes formed between the lter plates are then removed by introducing 45 air through the openings 43 and 44 and header G9, the iilter plates are washed, and the bottom is again returned to the position shown in Figure 4.

In the embodiment shown in Figures 8 and 9, the lter comprises a cylindrical casing l5 closed at one end i6 and provided with a removable cover il at the other end.V The cover is secured in position by swinging bolts T9 which fit into Y recesses formed in the iianges 'i9 and 89, respec- 55 tively,V of the, casing and cover. Filter plates 8|, provided with internal channels as previously described, arecarried by a frame composed of end plates S2 and side plates 83. The lter plates are maintained in spaced relation by grooved bars 84 secured to the side plates along the top and bottom edges thereof and are supported by inturned flanges 85 formed at the lower edges of the side plates 33. The irameworkwhich supports the filter plates is, in turn, supported by rollers 23S which run on rails 8l mounted on a support 88. The casing 'F5 is provided with an opening 59, through which the solution to be filtered Y is introduced and with openings 99 and 9| for Pipes 92 iilter plates, the pipes being connected to a header 93 which communicates with `a discharge pipe 94 for the ltrate. There are two series of pipes 35 92, 93 and 94, one on each side ofthe filter plates, the pipes 92 of each series communicating with the internal passages in alternate filter plates.

In the operation of this modification, the solution to be filtered containing solids in suspension is introduced through the opening 89, the openings 90 and 9i being plugged at this time. lThe solution flows between the lter plates, the solids collecting on the outer surfaces of the plates and the filtrate fiowing into the internal passages in a manner similar to that described in connection with the other embodiments. The filtrate is delivered from the plates by means of the pipe 92, header 93 and pipe 94. When it is `desired to remove the cakes formed between the lter plates, the solution is first removed through opening 89 and air is introduced through either or both of the openings 90 and 9| and the pipe 94.

If desired, the frame with the filter plates supported thereon is moved outside of the casing 15 after removing the cover 11, and the removal of the cakes is performed outside of the casing, after which the frame and plates may be again moved back within the casing. The cover is then closed and the filter plates are washed by introducing water through the pipes 94, after which the apparatus is again ready for performing another filtering operation.

The shape of the filter plates may be varied to suit conditions irrespective of the particular type of filter which is employed. In cases where the solution to be filtered will attack metal, the metal surfaces should be lined with rubber or other suitable material which resists the action of the solutions.

I have illustrated and described several embodiments of my invention. It is to be understood, however, that the invention may be otherwise embodied within the scope of the following claims.

I claim:

1. A filter comprising a casing having a top and a bottom which may be removed separately from the casing, a plurality of spaced porous filter plates in the casing providing spaces which are open at the top and bottom between the plates,

each of said filter plates consisting of a single.

unit provided with internal channels, means for forcing a fluid under pressure through said channels into 'the spaces between the filter plates to loosen deposits on the filter plates, and means operable simultaneously with said last mentioned means for creating a higher pressure in the space above said filter plates than in the space below them in order to remove the deposits formed between the filter plates.

2. A filter comprising a casing having a top and a bottom which may be removed separately from the casing, a plurality -of closely spaced porous filter plates in the casing providing spaces which are open at the top and bottom between the plates, each of said filter plates consisting -of a single unit provided with internal channels, said filter plates being so closely spaced that after the filtering operation has been completed they together with the deposits formed thereon seal the spaces above and below said lter plates from each other, means for forcing a fiuid under pressure through said channels into the spaces between the filter plates to loosen deposits on the open at the top and bottom between the plates, 10

each of said lter plates consisting of a single unit provided with vertical internal channels communicating adjacent their tops and bottoms with horizontal internal channels and having an outlet for the filtrate, means for forcing a fluid 15 under pressure through said channels into` the spaces between the filter plates to loosen deposits on the filter plates, and means operable simultaneously with said last mentioned means for creating a higher pressure in the space above 20 said filter plates than in the space below them in order to remove the deposits formed between the filter plates.

4. A filter comprising a casing having a top and a bottom which may the casing, a plurality of spaced porous ebonite filter plates in the casing providing spaces which are open at the top and bottom between the plates, each of said filter plates consisting of a single unit provided with internal means for forcing a fluid under pressure through said channels into the spaces between the filter plates to loosen deposits on the filter plates, and means operable simultaneously with said last be removed separately from 25 channels, 30

mentioned means for creating' a higher pressure 35 in the space above said filter plates than in the space below them in order to remove the deposits formed between the filter plates.

5. In a filtering operation, the method of removing deposits from the spaces between filter plates provided with internal channels, which O comprises forcing a iiuid under pressure through the channels into the spaces between the filter plates to loosen the deposits, and simultaneously creating a higher pressure on the tops of the deposits than on the bottoms thereof to force them 45 from said spaces.

6. In a filtering operation, the method 'of removing deposits from the spaces between filter plates provided with internal channels, which 5 comprises forcing a fluid under superatmospheric 0 i pressure through the channels into the spaces between the filter plates to loosen the deposits] and simultaneously applying a fluid under super`l atmospheric pressure to the tops of the deposits while maintaining the bottoms of the deposits at 55 'a lower pressure than that applied to the tops to force the deposits from said spaces.

'7. In a filtering operation, the method of re\ moving deposits from the spaces between filter plates provided with internal channels, which comprises forcing a fluid under superatmospheric pressure through the channels into the spaces between the filter plates to loosen the deposits, and simultaneously applying a fluid under superatmospheric pressure to the tops of the deposits while maintaining the bottoms of the deposits at atmospheric pressure to force the deposits from said spaces.

MEYER WILDERMAN. 

